Explain why force must be treated as a vector quantity.

In the subtopic Scalar and vector quantities, this learning objective focuses on explain why force must be treated as a vector quantity. For AQA GCSE Physics 8463 Unit 4.5 Forces, keep the explanation inside Scalar and vector quantities and Forces and their interactions. Approved keywords for this objective include vector and force. A strong answer separates scalar and vector quantities, uses correct units where quantities are involved, and links the physical reasoning back to explain why force must be treated as a vector quantity. This is not a generic revision point: it is specifically about Scalar and vector quantities, Forces and their interactions, and the approved wording of the learning objective.